Wicket.Event.add requires Wicket.$, but wicket-ajax-jquery is not listed as a dependency

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Description

The javascript file wicket-event-jquery.js defines the Wicket.Event.add (starting on line 135). In this function, Wicket.$ is called (line 143). Wicket.$ is defined in wicket-ajax-jquery.js on line 1149. But WicketEventJQueryResourceReference.java doesn't list wicket-ajax-jquery.js as a dependency, jQuery (line 58/62). So, there are cases when I've wanted to bind to an event using OnEventHeaderItem but the HTML source doesn't output the needed wicket-ajax-jquery.js because it is not listed as a dependency.